Fifteen of those arrested were Saudi nationals while the remaining three were from Yemen and Sudan.

Saudi Arabia has dismantled at least four Islamic State of Iraq and Syria (ISIS) cells made up of 18 individuals inside the kingdom, officials from the interior ministry confirmed.

Fifteen of those arrested were Saudi nationals while the remaining three were from Yemen and Sudan, the ministry said in statements made on Thursday.

The ministry also said that ISIS cells in Saudi Arabia have spread to Mecca, Medina, Riyadh and Qassim regions of the country.

In addition, nearly two million riyals were confiscated from the cells upon arrest.

“Some of those arrested were involved with supplying materials to the ISIS cells in the al-Yasmeen cells in Riyadh and others were linked to the two suicide attackers in Harazat rest area of Jeddah, both of which were dismantled in recent months,” said Maj. Gen. Mansour al-Turki, spokesperson for Saudi Arabia’s interior ministry.